Is it possible to freeze and block my paying account until I give notice to unfreeze and unblock it?
It's easy to block you from using your account and restore your access to it when you give notice.
But I assume you want your subscription prolonged for the duration of the freeze, which only the developer can do. Should I ask them about that option?
Yes, I'd like my subscription to be prolonged for the duration of the freeze. I hope that's an option.
I asked, and that's not a possibility considered right now.
OK, you can block my account until I give notice to unblock it.
Done!